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Using context
=============
.. warning::
The ``context`` attribute is deprecated and will be removed in marshmallow 4.
Use `contextvars.ContextVar` for passing context to fields, pre-/post-processing methods, and validators instead.
marshmallow 4 will also provide an `experimental helper API <https://marshmallow.readthedocs.io/en/latest/marshmallow.experimental.context.html>`_
for using context.
The ``context`` attribute of a `Schema <marshmallow.Schema>` is a general-purpose store for extra information that may be needed for (de)serialization.
It may be used in both ``Schema`` and ``Field`` methods.
.. code-block:: python
schema = UserSchema()
# Make current HTTP request available to
# custom fields, schema methods, schema validators, etc.
schema.context["request"] = request
schema.dump(user)
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